There are only two families that have three generations of Oscar winners.
The Huston family:
Walter Huston won Best Supporting Actor for his role in The Treasure of Sierra Madre); John Huston won Best Director, The Treasure of Sierra Madre in 1948, and Anjlica Huston won Best Supporting Actress for her role in Prizzi’sHonorin 1985. The Hustons are the only grandfather, father and daughter to have won Oscars (although not for the same movie, which would really be something, huh?).
The Coppola family:
Carmine Coppola won Best Original Dramatic Score, The Godfather in 1974; Francis Ford Coppola won Best Original Screenplay for Patron (1970), Best Adapted Screenplay, The Godfather (1970), Best Picture, Best Director and Best Original Screenplay, The Godfather: Part II (1974), and Sofia Coppola’s Lost in Translation won for Best Original Screenplay in 2004; Nicholas Cage, Francis Ford Coppola’s nephew, won Best Actor for his role in Leaving Las Vegas, in 1995.